This advisory also applies to the corresponding versions ofKubuntu, Edubuntu, and Xubuntu.

The problem can be corrected by upgrading your system to thefollowing package versions:

Ubuntu 6.06 LTS: libxml2 2.6.24.dfsg-1ubuntu1.2

Ubuntu 7.04: libxml2 2.6.27.dfsg-1ubuntu3.2

Ubuntu 7.10: libxml2 2.6.30.dfsg-2ubuntu1.2

Ubuntu 8.04 LTS: libxml2 2.6.31.dfsg-2ubuntu1.1

In general, a standard system upgrade is sufficient to effect thenecessary changes.

Details follow:

Andreas Solberg discovered that libxml2 did not handle recursive entitiessafely. If an application linked against libxml2 were made to processa specially crafted XML document, a remote attacker could exhaust thesystem's CPU resources, leading to a denial of service.